arcperftest: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/arcperftest - from package: nordugrid-arc-misc-utils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/arcperftest - from package: nordugrid-arc-misc-utils

You may install the required package with command apt-get install {package}

Error in other languages:
arcperftest: bevel nie gevind nie
arcperftest: comandă negăsită
arcperftest: comando não encontrado
arcperftest: commande introuvable
arcperftest: command not found
arcperftest: käsku ei ole
arcperftest: không tìm thấy lệnh
arcperftest: komanda nerasta
arcperftest: Kommando nicht gefunden.
arcperftest: kommandot finns inte
arcperftest: komut yok
arcperftest: nie znaleziono polecenia
arcperftest: níor aimsíodh an t-ordú
arcperftest: no se encontró la orden
arcperftest: no s'ha trobat l'ordre
arcperftest: opdracht niet gevonden
arcperftest: parancs nem található
arcperftest: perintah tidak ditemukan
arcperftest: príkaz nenájdený
arcperftest: příkaz nenalezen
arcperftest: команда не найдена
arcperftest: командата не е открита
arcperftest: 命令找不到
arcperftest: コマンドが見つかりません